LDX-3500 Series
29
A P P E N D I X
A
T
ROUBLESHOOTING
This appendix is a guide to troubleshooting the LDX-3500 Series Precision
Current Source. Some of the more common symptoms are listed here, and the
appropriate troubleshooting actions are given. We recommend that the user start
at the beginning of this guide. Read the symptom descriptions, and follow the
steps for the corrective actions which apply. If you encounter problems which are
beyond the scope of this guide, contact your ILX Lightwave representative.
SYMPTOM
CORRECTIVE ACTION
LDX-3500 Series unit will not
power up
Check AC power line voltage and power cord connection
Power on, but display is frozen,
switches don’t work
This may occur if the unit loses power (AC line) briefly. Turn
the power switch off and on again to restart
Power on, but no current output
Check the Interlock and back panel ENABLE key switch
If OPEN CIRCUIT indicator is lit, check the load connections
and then try again
On the LDX-3565, an OPEN error may be indicated as a result
of internal overheating
Check the OUTPUT ON switch, the LED should be lit
Unable to adjust output
Check the ADJUST ENBL switch; the indicator must be lit for
any adjustments to be made
Check the I LIMIT parameter; see that it is set above 0 mA
Output current at limit; cannot be
lowered
If POWER mode is used, check the monitor diode (feedback)
connections. Try reversing the polarity of the monitor
photodiode. Check the photodiode bias adjustment on the
back panel
If I CW of I HBW mode, check the current set point and I LIMIT
setting. Setting the output below the limit may require several
turns of the adjust know if the set point is much greater than
the desired limit setting.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
